IS THIS A SAD LOVE STORY?

It's not believable. I would never buy it. Two people don't look at each other and fall in love, and even if they did, no girl would still feel that after she knew he was a murderer when all she knew about him was that he killed his parents. And, in addition, no police officer would allow them to go on a ride together, without handcuffs, alone after having just caught him. I wouldn't read it because I wouldn't believe it. If you worked on it and made it more plausible, I might enjoy it. Good luck. :)